<template>
  <div class="my-counter">
    <button
      type="button"
      class="btn btn-light"
      :disabled-="obj.goods_count === 1"
      @click="obj.goods_count > 1 && obj.goods_count--"
    >
      -
    </button>
    <input type="number" class="form-control inp" v-model.number="obj.goods_count" />
    <button type="button" class="btn btn-light" @click="obj.goods_count++">
      +
    </button>
  </div>
</template>

<script>
export default {
  props: {
    obj: {
      type: Object,
      required: true,
    }
  },
  watch:{
    // obj:{
    //   deep:true,
    //   handler(){ //拿到商品数量,判断小于1
    //     if(this.obj.goods_count < 1){
    //       this.obj.goods_count = 1
    //     }
    //   }
    // }
    'obj.goods_count'(newv){
      if(newv < 1 ) {
        this.obj.goods_count = 1
      }
    }
  }
};
</script>

<style lang="less" scoped>
.my-counter {
  display: flex;
  .inp {
    width: 60px;
    text-align: center;
    margin: 0 10px;
  }
  .btn,
  .inp {
    transform: scale(0.9);
  }
}
</style>